nofew@NoClock ~/VIDEO $ ./ffmpeg -i MushVis_RAW.flv -vcodec libx265 -x265-params crf=22 -preset medium -movflags faststart -pix_fmt yuv420p -vf scale=640:-1 -acodec copy OU265.mkv
ffmpeg version 2.1.3-   http://johnvansickle.com/ffmpeg/    Copyright (c) 2000-2013 the FFmpeg developers
  built on Jan 22 2014 19:50:14 with gcc 4.8 (Debian 4.8.2-14)
  configuration: --enable-gpl --enable-version3 --disable-shared --disable-debug --enable-runtime-cpudetect --enable-libmp3lame --enable-libx264 --enable-libspeex --enable-libvorbis --enable-libvpx --enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg --disable-ffserver
  libavutil      52. 48.101 / 52. 48.101
  libavcodec     55. 39.101 / 55. 39.101
  libavformat    55. 19.104 / 55. 19.104
  libavdevice    55.  5.100 / 55.  5.100
  libavfilter     3. 90.100 /  3. 90.100
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
  libpostproc    52.  3.100 / 52.  3.100
Unrecognized option 'x265-params'.
Error splitting the argument list: Option not found
nofew@NoClock ~/VIDEO $ ./ffmpeg -i MushVis_RAW.flv -vcodec libx265 -preset medium -movflags faststart -pix_fmt yuv420p -vf scale=640:-1 -acodec copy OU265.mkv
ffmpeg version 2.1.3-   http://johnvansickle.com/ffmpeg/    Copyright (c) 2000-2013 the FFmpeg developers
  built on Jan 22 2014 19:50:14 with gcc 4.8 (Debian 4.8.2-14)
  configuration: --enable-gpl --enable-version3 --disable-shared --disable-debug --enable-runtime-cpudetect --enable-libmp3lame --enable-libx264 --enable-libspeex --enable-libvorbis --enable-libvpx --enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg --disable-ffserver
  libavutil      52. 48.101 / 52. 48.101
  libavcodec     55. 39.101 / 55. 39.101
  libavformat    55. 19.104 / 55. 19.104
  libavdevice    55.  5.100 / 55.  5.100
  libavfilter     3. 90.100 /  3. 90.100
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
  libpostproc    52.  3.100 / 52.  3.100
Input #0, flv, from 'MushVis_RAW.flv':
  Metadata:
    fileSize        : 22554014483
    audiochannels   : 2
    encoder         : Open Broadcaster Software v0.592b
  Duration: 00:07:09.00, start: 0.000000, bitrate: 420587 kb/s
    Stream #0:0: Video: h264 (High 4:4:4 Predictive), yuv420p(tv, bt709), 1920x1080, 204800 kb/s, 60 tbr, 1k tbn, 2k tbc
    Stream #0:1: Audio: mp3, 44100 Hz, stereo, s16p, 262 kb/s
Unknown encoder 'libx265'
nofew@NoClock ~/VIDEO $